yeah, the salesman at lowe told me also not to cut but I'm tired of my back hurting.
So I called Lowe customer service and the guy called me back today and said he'd send me a schematic of the deck but it doesn't sound lie it matters if I cut through a stringer. He advised that If i cut through a support to just brace it with an aluminum leg. Thanks Rhuff, Ill give its shot with the jig saw.